Service Manual

Air Compressor ISB, ISBe and QSB (Common Rail [...]
Page 12-24 Section 12 - Compressed Air System - Group 12
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Remove the mounting nut, capscrew, and air compressor.
Discard the gasket.
Clean and Inspect for Reuse
Inspect the air compressor housing for cracks or other
damage.
Inspect the drive gear for cracks or other damage.
Make sure the gasket surfaces of the gear housing and air
compressor are clean and not damaged.
Remove the air compressor cylinder head if it is not
already removed. Refer to Procedure 012-007 in Section
12.
Inspect the inside circumference for vertical scratches
deep enough to be felt with a fingernail.
If a fingernail catches in the scratch, the air compressor
must be replaced.
Inspect the inside circumference for scuffing, scoring, or
polishing.